JP2016535151A - Double-sided adhesive tape - Google Patents

Abstract

Provided is a double-sided pressure-sensitive adhesive tape that can be easily peeled off from the pressure-sensitive adhesive surface regardless of which side the release liner is peeled off. Provided is a double-sided pressure-sensitive adhesive tape having a base material layer, a pressure-sensitive adhesive layer laminated on both surfaces of the base material layer, and a release liner laminated on the pressure-sensitive adhesive layer. Each of the release liners has a peeling force with respect to the pressure-sensitive adhesive layer surface measured in accordance with JIS Z0237 of 0.01 N / 50 mm or more and less than 0.30 N / 50 mm.

Description

  The present invention relates to a pressure-sensitive adhesive tape, and particularly to a double-sided pressure-sensitive adhesive tape that is suitably used in the manufacture (assembly) of various OA devices, portable devices, and electronic components.

  In recent years, portable devices such as mobile phones, digital cameras, and PDAs (Personal Digital Assistants) have been downsized. For this reason, various electronic components to be mounted are also reduced in size and thickness. For example, a mobile phone, which is a representative device as a mobile device, has a tendency to reduce the thickness of each major component. Usually, the display part of a portable device is mainly composed of an LCD module and a backlight unit, and various sheet-like components are laminated in order to develop functions such as light emission, reflection, light shielding, and light guide. Then, the double-sided adhesive tape for using for the assembly (joining) of these components is devised (refer patent document 1).

  As shown in FIG. 1, a typical double-sided pressure-sensitive adhesive tape has a structure in which a pressure-sensitive adhesive layer 12 is formed on one surface of a base material layer 11 and a pressure-sensitive adhesive layer 12 ′ is formed on the other surface. ing. In the double-sided pressure-sensitive adhesive tape 10, the pressure-sensitive adhesive layer 12 ′ is protected by a release liner (separator) 13, and the other side of the pressure-sensitive adhesive layer 12 and the release liner 13 (opposite to the pressure-sensitive adhesive layer 12 ′). It is often observed that they are superposed so as to be in contact with each other and wound into a roll shape.

Japanese Patent Application Publication No. 2012-52099

  The release liner 13 used in the double-sided pressure-sensitive adhesive tape is composed of a release liner provided on one surface of a pressure-sensitive adhesive body comprising a base material layer 11 and pressure-sensitive adhesive layers 12 and 12 ′ formed on both surfaces thereof, and the pressure-sensitive adhesive body. The peeling force between one surface of the adhesive body (the force required to peel the release liner from the adhesive body) and the peeling force between the release liner provided on the other surface of the adhesive body and the other surface of the adhesive body In general, it is different from the viewpoint of the release workability of the release liner.

  When using such a double-sided pressure-sensitive adhesive tape for adherends such as the above-mentioned electrical / electronic parts, usually the release liner on the side of the double-sided pressure-sensitive adhesive tape having the smaller peel force (light release side) is first peeled off. After being attached to one of the members of the adherend, the release liner on the side with the larger peel force (heavy release side) is peeled off and attached to the other member.

  Therefore, when using a conventional double-sided pressure-sensitive adhesive tape, it is necessary to first release the release liner on the light release side (before the release liner on the heavy release side), so before releasing the release liner, It is necessary to confirm which side is the light release side. If the difference between the peel force on the heavy peel side and the peel force on the light peel side [(peel force on the heavy peel side) − (peel force on the light peel side)] is too small, Problems may occur. On the other hand, if the difference between the release forces is too large, when the release liner on the heavy release side is first peeled off, “floating” occurs at the interface between the release liner on the light release side and the adhesive layer surface ( A phenomenon in which voids are generated) or peeling (so-called “crying phenomenon”) may occur. Moreover, since it is necessary to peel off the release liner on the light release side first, if the member to be attached to each adhesive layer surface (adhesive surface) in the double-sided adhesive tape is determined, the member is attached to the double-sided adhesive tape. The order in which they are applied is also determined, and the degree of freedom (selectivity) and workability when using a double-sided adhesive tape are low. On the other hand, when a release liner (light release liner, heavy release liner) is provided on the surface of the double-sided pressure-sensitive adhesive tape corresponding to the order in which the members are attached, the degree of freedom (selectivity) when producing the double-sided pressure-sensitive adhesive tape, Workability is reduced.

Accordingly, an object of the present invention is to provide a double-sided pressure-sensitive adhesive tape in which the above-described floating or crying phenomenon hardly occurs.
It is another object of the present invention to provide a double-sided pressure-sensitive adhesive tape that can be easily peeled off from the pressure-sensitive adhesive surface even if the release liner is peeled off from either side.

  As a result of intensive studies to achieve the above-mentioned object, the inventors of the present invention have lightly peeled both surfaces of the two release liners in contact with the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape, so that the floating or It has been found that a double-sided pressure-sensitive adhesive tape that does not cause tearing can be produced. In addition, by doing so, when using adhesive tape, the release liner can be easily peeled off even if it is peeled off first from either side of the release liner, increasing the degree of freedom and workability during use. I found out that I can. The present invention has been completed based on these findings.

  That is, according to the present invention, there is provided a double-sided pressure-sensitive adhesive tape comprising a base material layer, a pressure-sensitive adhesive layer laminated on each side of the base material layer, and a release liner laminated on each pressure-sensitive adhesive layer. . Each of the release liners has a peeling force with respect to the pressure-sensitive adhesive layer surface measured in accordance with JIS Z0237 of 0.01 N / 50 mm or more and less than 0.30 N / 50 mm.

  The release liner preferably has a configuration in which a release treatment layer is formed on the surface of a film or sheet as a substrate. The release treatment layer is preferably a light release type release treatment layer, and typically is a release treatment layer having a release force of 0.01 N / 50 mm or more and less than 0.30 N / 50 mm from the surface of the pressure-sensitive adhesive layer. .

  The release liner preferably has a peel strength with respect to the pressure-sensitive adhesive layer surface measured in accordance with JIS Z0237 of 0.05 N / 50 mm or more and 0.28 N / 50 mm or less, and 0.07 N / 50 mm or more and 0. More preferably, it is 25 N / 50 mm or less.

  The adhesive layer preferably has a 180 ° peel-off adhesive strength measured in accordance with JIS Z0237 of 2 to 20 N / 20 mm.

  In the double-sided pressure-sensitive adhesive tape of the present invention, the holding force of the pressure-sensitive adhesive layer measured according to JIS Z0237 is preferably 5.0 mm / hr or less.

In a preferred embodiment of the double-sided pressure-sensitive adhesive tape disclosed herein, the peeling force between the two release liners on both sides of the base material layer and the pressure-sensitive adhesive layer surface is substantially the same.
Moreover, in another preferable aspect of the double-sided pressure-sensitive adhesive tape disclosed herein, the peeling forces of the two release liners on both sides of the base material layer from the pressure-sensitive adhesive layer surface are different from each other. That is, the peeling force of the release liner on the surface of the pressure-sensitive adhesive layer on both sides of the base material layer is different from each other. In such an embodiment, it is preferred that the relatively large peel force does not exceed 200% of the relatively small peel force.

  The release liner is preferably based on a polyester film or sheet.

  According to the double-sided pressure-sensitive adhesive tape of the present invention, since both surfaces of the pressure-sensitive adhesive layer and the surface of the release liner to be attached (release surface) are both light-release type surfaces, the pressure-sensitive adhesive layer floats and cries The release liner can be peeled off without causing any problems. Moreover, when manufacturing the double-sided pressure-sensitive adhesive tape of the present invention, it is not necessary to bond the corresponding peeling surface to the pressure-sensitive adhesive surface corresponding to the order of attachment to the member. be able to. Therefore, the degree of freedom (selectivity) and workability when manufacturing the double-sided pressure-sensitive adhesive tape can be greatly improved.

FIG. 1 is a schematic cross-sectional view showing an example of a double-sided pressure-sensitive adhesive tape. FIG. 2 is a schematic sectional view showing an example of the double-sided pressure-sensitive adhesive tape in the present invention.

DESCRIPTION OF SYMBOLS 10 Double-sided adhesive tape 11 Base material layer 12,12 'Adhesive layer 13 Release liner 20 Double-sided adhesive tape 21 Base material layer 22,22' Adhesive layer 23,23 'Release liner

  Hereinafter, preferred embodiments of the present invention will be described. Note that matters other than matters specifically mentioned in the present specification and necessary for the implementation of the present invention can be grasped as design matters of those skilled in the art based on the prior art in this field. The present invention can be carried out based on the contents disclosed in this specification and common technical knowledge in the field.

  The double-sided pressure-sensitive adhesive tape of the present invention has a base material layer, a pressure-sensitive adhesive layer laminated on each side of the base material layer, and a release liner laminated on each of the pressure-sensitive adhesive layers. The surface in contact with the pressure-sensitive adhesive layer surface is a light release type surface.

  Thus, in the double-sided pressure-sensitive adhesive tape of the present invention, the surface of the release liner in contact with the pressure-sensitive adhesive layer surface is a light release type surface, so even if the release liner is peeled off from one surface of the pressure-sensitive adhesive layer, the other pressure-sensitive adhesive tape is used. At the interface between the surface of the agent layer and the release liner, the so-called “floating” (gap from the release liner) and “crying phenomenon” (a phenomenon that cannot be peeled off at a given interface and peeling occurs at another interface) ) Is unlikely to occur.

  In this specification, the “light release type” release liner is the force required to release the release liner from the adhesive surface of the double-sided adhesive tape, that is, the release liner measured in accordance with JIS Z0237 as described later. 180 ° peel peel strength (also referred to as peel force) (N / 50 mm) is 0.01 N / 50 mm or more and less than 0.30 N / 50 mm, preferably 0.05 N / 50 mm or more and 0.28 N / 50 mm or less, more preferably It means a release liner that is 0.07 N / 50 mm or more and 0.25 N / 50 mm or less.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings and tables. In each of the following embodiments, a double-sided pressure-sensitive adhesive tape having an adhesive layer on both sides of a base material layer serving as a support will be described as an example. That is, “double-sided pressure-sensitive adhesive sheet” is also included.

(Base material layer)
The double-sided pressure-sensitive adhesive tape of the present invention may have a base material as a support or may not have a base material, but preferably has a base material. Although it does not specifically limit as such a base material, From a viewpoint of intensity | strength, thickness precision, thinness, etc., a plastic-type base material can be used suitably. Examples of the material or material of the plastic base material include polyester (polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, ethylene-propylene copolymer, etc.), and polyvinyl alcohol. , Polyvinylidene chloride, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyamide, polyimide, cellulose, fluororesin, polyether, polystyrene resin (polystyrene, etc.), polycarbonate, polyethersulfone, etc. Is mentioned. Among these, from the viewpoint of cost and rigidity, a polyester film and a polyolefin film are preferable, and a polyethylene terephthalate (PET) film is more preferable. In addition, the plastic film base material may have a single layer form or may have a multiple layer form.

  The thickness of the base material layer can be appropriately selected according to the strength and flexibility required for the double-sided pressure-sensitive adhesive tape, the purpose of use of the double-sided pressure-sensitive adhesive tape, and the like. In the present invention, the thickness of the adhesive body excluding the release liner and the step followability (also referred to as “step absorbability”) of the double-sided adhesive tape. When applying the adhesive tape, it is easy to follow the step shape of the adherend. The thickness of the base material layer is preferably 40 μm or less, and more preferably 25 μm or less from the standpoint of properties. For example, the significance of applying the technique disclosed herein can be effectively exerted in a double-sided pressure-sensitive adhesive tape having a base material layer thickness of 15 μm or less (further 13 μm or less, for example, 12 μm or less). Although the minimum of the thickness of a base material layer is not specifically limited, From viewpoints, such as handleability, it is usually suitable that it is 2 micrometers or more, and it is preferable to set it as 4 micrometers or more. In a preferred embodiment, the thickness of the base material layer can be 4 to 12 μm.

(Adhesive layer)
The pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer (hereinafter also referred to as “pressure-sensitive adhesive composition”) is not particularly limited, and examples thereof include urethane-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. Well-known pressure-sensitive adhesives such as adhesives, polyester-based pressure-sensitive adhesives, polyamide-based pressure-sensitive adhesives, epoxy-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, and fluorine-based pressure-sensitive adhesives. An adhesive can be used individually by 1 type or in combination of 2 or more types. The pressure-sensitive adhesive may be any pressure-sensitive adhesive, and examples thereof include an emulsion-type pressure-sensitive adhesive, a solvent-type pressure-sensitive adhesive, and a hot-melt-type pressure-sensitive adhesive (hot-melt-type pressure-sensitive adhesive). .

Preferable examples of the pressure-sensitive adhesive in the technology disclosed herein include an acrylic pressure-sensitive adhesive and a rubber-based pressure-sensitive adhesive. Among these, an acrylic pressure-sensitive adhesive is preferable from the viewpoints of excellent heat resistance and weather resistance and flexibility in design. The acrylic pressure-sensitive adhesive contains an acrylic polymer as a main component or a base polymer. Further, as the base polymer (basic component of the pressure-sensitive adhesive), a (meth) acrylic acid alkyl ester having 4 to 12 carbon atoms in the alkyl group (which means a generic meaning of an acrylic acid alkyl ester and a methacrylic acid alkyl ester). It is preferable to use a polymer ((meth) acrylic acid C _4-12 alkyl ester-based polymer) having a monomer as a main component. The (meth) acrylic acid C _4-12 alkyl ester-based polymer can be used alone or in combination of two or more.

(Meth) acrylic acid alkyl ester having 4 to 12 carbon atoms in the alkyl group [(meth) acrylic acid C _4-12 alkyl ester] is an alkyl (meth) acrylate having 4 to 12 carbon atoms in the alkyl group. Although it will not restrict | limit especially if it is ester, For example, (meth) acrylate butyl, (meth) acrylate isobutyl, (meth) acrylate s-butyl, (meth) acrylate t-butyl, (meth) acrylate pentyl, Isopentyl (meth) acrylate, neopentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate , (Meth) acrylic acid nonyl, (meth) acrylic acid isononyl, (meth) acrylic acid deci , Isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, and the like. (Meth) acrylic acid C _4-12 alkyl ester can be used alone or in combination of two or more.

(Meth) acrylic acid C _4-12 alkyl ester is used as a monomer main component, and a proportion of 50% by weight or more (preferably 70% by weight or more, more preferably 85% by weight or more) with respect to the total amount of monomer components. Can be used. When the ratio of the (meth) acrylic acid C _4-12 alkyl ester to the total amount of the monomer components is less than 50% by weight, the adhesive strength and holding power are lowered, and the good adhesive strength and holding force required as an adhesive tape or sheets are required. Power may not be obtained.

The upper limit of the ratio of the (meth) acrylic acid C _4-12 alkyl ester to the total amount of monomer components is not particularly limited, and is, for example, 99% by weight or less, preferably 98% by weight or less (for example, 97% by weight or less). It is desirable.

  When the acrylic base polymer is used, the weight average molecular weight is not particularly limited, but is usually 300,000 to 2,000,000 (preferably 600,000 to 1,500,000, more preferably 700,000 to 1.3 million). preferable. If the weight average molecular weight of the acrylic base polymer is less than 300,000, it may not be possible to develop the necessary tackiness as an adhesive. On the other hand, if it exceeds 2 million, coating due to an increase in the viscosity of the adhesive. Problems such as poor workability may occur.

  In addition, a crosslinking agent may be added to the acrylic pressure-sensitive adhesive in order to improve the cohesive force. Specifically, an isocyanate compound, a polyfunctional melamine compound, a polyfunctional epoxy compound, or the like can be used. Among these, an isocyanate compound is preferable because it is relatively easy to balance the adhesive force and the cohesive force. The isocyanate compound is not particularly limited as long as it is a compound having at least two isocyanate groups in one molecule. Examples of the isocyanate compound include aliphatic polyisocyanates, alicyclic polyisocyanates, aromatic polyisocyanates, and araliphatic polyisocyanates.

  A crosslinking agent can be used individually by 1 type or in combination of 2 or more types.

  Furthermore, a crosslinking aid may be added for the purpose of introducing crosslinking points. As the crosslinking aid, for example, a polyhydroxy compound having two or more hydroxy groups in one molecule can be used. Examples of such polyhydroxy compounds include aliphatic polyols, alicyclic polyols, aromatic polyols, polyether polyols, polyester polyols, polycarbonate polyols, polycaprolactone polyols, acrylic polyols, polyurethane polyols, and the like.

  A crosslinking aid can be used individually by 1 type or in combination of 2 or more types.

  In addition, since the acrylic polymer has high polarity, it is difficult to adhere to a low-polarity adherend such as polyolefin. Therefore, a tackifier may be added to the pressure-sensitive adhesive as necessary.

  Although it does not restrict | limit especially as tackifying resin, For example, various rosin type, terpene type, hydrocarbon type, an epoxy type, a polyamide type, an elastomer type, a phenol type, a ketone type, etc. can be used. Such tackifier resin can be used individually by 1 type or in combination of 2 or more types.

  Specifically, as the rosin-based tackifying resin, for example, unmodified rosin (raw rosin) such as gum rosin, wood rosin, tall oil rosin; these unmodified rosins are modified by hydrogenation, disproportionation, polymerization, etc. Modified rosin (hydrogenated rosin, disproportionated rosin, polymerized rosin, other chemically modified rosins, etc.); other various rosin derivatives; Examples of the rosin derivatives include those obtained by esterifying unmodified rosin with alcohols (that is, rosin esterified products) and modified rosins (hydrogenated rosin, disproportionated rosin, polymerized rosin, etc.) with alcohols. Rosin esters such as modified rosin esterified products (ie, unmodified rosins and modified rosins (hydrogenated rosin, disproportionated rosin, polymerized rosin, etc.) modified with unsaturated fatty acids. Unsaturated fatty acid-modified rosin esters obtained by modifying rosin esters with unsaturated fatty acids; Unmodified rosin, modified rosin (hydrogenated rosin, disproportionated rosin, polymerized rosin, etc.), unsaturated fatty acid-modified rosin or unsaturated fatty acid Rosin alcohols obtained by reducing carboxyl groups in modified rosin esters; unmodified rosin, modified rosin Metal salts of rosins (particularly rosin esters) such as rosin and various rosin derivatives; obtained by adding phenol to an rosin (unmodified rosin, modified rosin, various rosin derivatives, etc.) with an acid catalyst and thermal polymerization. Rosin phenol resin; and the like.

  Examples of terpene-based tackifier resins include terpene resins such as α-pinene polymers, β-pinene polymers, and dipentene polymers; these terpene resins are modified (phenol-modified, aromatic-modified, hydrogenated-modified, Modified terpene resin modified with hydrocarbon, etc.). Examples of the modified terpene resin include terpene-phenol resins, styrene modified terpene resins, aromatic modified terpene resins, hydrogenated terpene resins, and the like.

  Examples of the hydrocarbon-based tackifier resin include aliphatic hydrocarbon resins, aromatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aliphatic / aromatic petroleum resins (styrene-olefin copolymers, etc. ), Various hydrocarbon resins such as aliphatic / alicyclic petroleum resins, hydrogenated hydrocarbon resins, coumarone resins, coumarone indene resins, and the like. Examples of the aliphatic hydrocarbon resin include polymers of one or more aliphatic hydrocarbons selected from olefins and dienes having about 4 to 5 carbon atoms. Examples of the olefin include 1-butene, isobutylene, 1-pentene and the like. Examples of the diene include butadiene, 1,3-pentadiene, isoprene and the like. Examples of the aromatic hydrocarbon resin include polymers of vinyl group-containing aromatic hydrocarbons having about 8 to 10 carbon atoms (such as styrene, vinyl toluene, α-methylstyrene, indene and methylindene). Aliphatic cyclic hydrocarbon resins include so-called “C4 petroleum fractions” and “C5 petroleum fractions” which are polymerized after cyclization and dimerization; cyclic diene compounds (cyclopentadiene) , Dicyclopentadiene, ethylidene norbornene, dipentene, etc.) polymers or hydrogenated products thereof; aromatic hydrocarbon resins or alicyclic hydrocarbon resins obtained by hydrogenating aromatic rings of aliphatic / aromatic petroleum resins; Etc. are exemplified.

  In the pressure-sensitive adhesive, if necessary, for example, a filler, a flame retardant, an anti-aging agent, an antistatic agent, a softening agent, an ultraviolet absorber, an antioxidant, a plasticizer, a surfactant, a colorant ( Dyes, pigments, etc.), known additives such as light stabilizers, and the like may be included.

  In the double-sided pressure-sensitive adhesive tape of the present invention, the initial cohesive force after application of the pressure-sensitive adhesive is excellent, and can be bonded with an excellent holding force. Moreover, the double-sided pressure-sensitive adhesive tape can be adhered to various adherends with excellent adhesive force.

  In the present invention, the adhesive layer has a 180 ° peel-off adhesive strength of preferably 2 to 20 N / 20 mm, and more preferably 4 to 12 N / 20 mm. Here, the 180-degree peeling adhesive strength is based on JIS Z0237, using a stainless steel (SUS304) plate as an adherend, and after 30 minutes of pressure bonding to the adherend, a tensile speed of 300 mm / min. 180 degree peeling adhesive force measured under conditions. In the double-sided pressure-sensitive adhesive tape disclosed here, one of the pressure-sensitive adhesive surfaces (one surface) and the other pressure-sensitive adhesive surface (two surfaces) of the pressure-sensitive adhesive body excluding the release liner exhibits the above-mentioned 180 ° peeling adhesive strength. preferable.

The double-sided pressure-sensitive adhesive tape disclosed herein preferably has a holding force of the pressure-sensitive adhesive layer of 5.0 mm / hr or less, more preferably 2.0 mm / hr or less. Here, in accordance with JIS Z0237, the holding force is a load of 500 g 30 minutes after a bakelite plate is used as an adherend, and a double-sided adhesive tape is pressure-bonded to the adherend with a sticking area of 20 mm × 20 mm. The retention strength obtained by measuring the shift | offset | difference distance from the 1st sticking position of a double-sided adhesive tape, after leaving for 1 hour. It is preferable that one side and two sides of the pressure-sensitive adhesive body (double-sided pressure-sensitive adhesive tape excluding the release liner) exhibit the above-mentioned holding power. It is preferable that both the first surface and the second surface of) exhibit the above-mentioned holding force.
Further, the double-sided pressure-sensitive adhesive tape disclosed herein has a holding force measured in accordance with JIS Z0237 of 5.0 mm with respect to an adherend to which the pressure-sensitive adhesive layer surface (adhesive surface) of the double-sided pressure-sensitive adhesive tape is attached. / Hr or less is preferable, and 2.0 mm / hr or less is more preferable. It is preferable that both the first surface and the second surface of the pressure-sensitive adhesive body exhibit the above-described holding force.

  The thickness of the pressure-sensitive adhesive layer (thickness of the pressure-sensitive adhesive layer on one side of the pressure-sensitive adhesive body) is not particularly limited, but the adhesive properties and the total thickness of the base material layer and the pressure-sensitive adhesive layer formed on both surfaces thereof are not limited. Or it can select suitably in consideration of level | step difference followability and handling property. Preferably it is 1-30 micrometers, More preferably, it is 10-25 micrometers, More preferably, it is 13-20 micrometers. If the thickness of the pressure-sensitive adhesive layer is less than 1 μm, it tends to be difficult to obtain good adhesiveness. On the other hand, if the thickness exceeds 30 μm, the thickness of the double-sided pressure-sensitive adhesive tape increases and flexible printing is performed using the double-sided pressure-sensitive adhesive tape. It may be disadvantageous for the thin film and the miniaturization of the product manufactured by fixing the circuit board and the like. The pressure-sensitive adhesive layer may have either a single layer or multiple layers. In addition, the thicknesses of the two pressure-sensitive adhesive layers formed on both surfaces of the base material layer may be substantially the same or different, but there are cases where the substantially same thickness is selected. Many.

In the present invention, the total thickness of the base material layer and the pressure-sensitive adhesive layer formed on both surfaces thereof (that is, the thickness of the pressure-sensitive adhesive excluding the release liner) may be in the range of 3 to 80 μm, preferably It is 10-60 micrometers, More preferably, it is 25-50 micrometers, More preferably, it is 30-45 micrometers. When the thickness of the pressure-sensitive adhesive exceeds 80 μm, it is disadvantageous for thinning and miniaturization of a product (for example, a hard disk drive) manufactured using the double-sided pressure-sensitive adhesive tape of the present invention. If the thickness is less than 3 μm and too thin, the workability, handleability, and adhesiveness of the double-sided pressure-sensitive adhesive tape may deteriorate.
The thickness of the pressure-sensitive adhesive layer formed on both surfaces of the base material layer may be the same or different. Usually, it is preferable that the thickness of the pressure-sensitive adhesive layer formed on both surfaces of the base material layer is approximately the same. For example, the thickness of the pressure-sensitive adhesive layer formed on two surfaces of the base material layer is 0.8 times to 1.2 times (preferably with respect to the thickness of the pressure-sensitive adhesive layer formed on one surface of the base material layer. 0.9 times to 1.1 times, more preferably 0.95 times to 1.05 times, typically 1.0 times).

  Although it does not specifically limit, the double-sided adhesive tape disclosed here is the sum total of the adhesive layer formed in both surfaces (1 side and 2 sides) of this base material layer with respect to the thickness of a base material layer. It can be suitably implemented in an embodiment where the thickness is greater than twice. The total thickness of the pressure-sensitive adhesive layers formed on both surfaces of the base material layer is preferably 3 times or more, preferably 4 times or more (for example, 5 times or more) with respect to the thickness of the base material layer. More preferred. As described above, by increasing the ratio of the total thickness of the pressure-sensitive adhesive layer to the thickness of the base material layer, the step following property and the adhesion to the adherend (for example, 180 ° peeling adhesive strength) can be increased. Can be balanced at the level. In the embodiment in which the thickness of the base material layer is 15 μm or less (for example, 13 μm or less), the above-mentioned “ratio of the total thickness of the pressure-sensitive adhesive layer to the thickness of the base material layer” can be particularly preferably employed. As the thickness of the pressure-sensitive adhesive layer increases, the peeling force of the release liner from the surface of the pressure-sensitive adhesive layer tends to increase. Therefore, it is particularly meaningful to limit the peeling force by applying the technology disclosed herein. is there.

(Release liner)
The release liner is not particularly limited, and can be appropriately selected from known release liners. As the release liner, a substrate having a release coat layer formed on at least one surface of a substrate (release liner substrate) can be suitably used. Examples of the base material of the release liner include various thin leaf bodies such as plastic film, paper, foamed body, metal foil, and the like. Usually, a plastic film is preferably used. Examples of the material of the plastic film of the base material of the release liner include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene and ethylene-propylene copolymers, and thermoplastic resins such as polyvinyl chloride. From the standpoint that it has good adhesion and familiarity with respect to it, and also has excellent stiffness, so that even if it is bent in various steps, it does not float and can maintain a state of being well bonded to the adhesive surface Examples of preferable release liner base materials include olefin films made of polyolefin resins and polyester films made of polyester resins. In addition, the base material of the release liner may have any form of a single layer or a multilayer.

  As the polyolefin-based resin, polyethylene, polypropylene, and an ethylene-α-olefin copolymer are suitable, and among them, polyethylene (particularly, linear low-density polyethylene and low-density polyethylene) can be suitably used. Therefore, as the polyolefin release liner, a polyethylene release liner using a polyethylene film or sheet (particularly, a linear low density polyethylene film or sheet, a low density polyethylene film or sheet) can be suitably used.

  Examples of the polyester resin include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polybutylene naphthalate. Of these, PET is preferable. Accordingly, a PET release liner using a PET film can be suitably used.

  The thickness of the base material in the release liner is not particularly limited, and can be appropriately selected from the range of, for example, 5 to 75 μm (preferably 8 to 50 μm, more preferably 12 to 40 μm). If the thickness is too large, the rigidity becomes high, the followability to the surface on the pressure-sensitive adhesive layer side is lowered, and the release liner is likely to float. Moreover, when it lengthens, a roll diameter may become large and may be bulky. On the other hand, when the thickness is less than 5 μm, the workability when peeling the release liner may be inferior. When the double-sided pressure-sensitive adhesive tape of the present invention has two release liners, the thicknesses of the two release liners may be substantially the same or different.

  The double-sided pressure-sensitive adhesive tape disclosed herein can be preferably implemented in a mode in which the thicknesses of the two release liners are different. By increasing the thickness of one of the two release liners compared to the other one, it is possible to improve the workability (for example, punchability) of the double-sided pressure-sensitive adhesive tape before the release liner is peeled off. . In addition, the total thickness of the double-sided pressure-sensitive adhesive tape (thickness including the pressure-sensitive adhesive body and the two release liners) can be reduced as compared with the case where the thicknesses of both of the two release liners are increased. Floating can also be suppressed. Further, it is preferable to increase the thickness of the release liner on one side as compared with the other side, in addition to workability, which makes it easy to create a trigger for peeling (good picking property). When the thickness of the base material layer is 15 μm or less (for example, 13 μm or less), it is particularly meaningful to achieve both workability and other characteristics by changing the thickness of the release liner as described above. .

  Although not particularly limited, the difference between the thicknesses of the two release liners is usually appropriately less than 50 μm, and preferably 40 μm or less from the viewpoint of better suppressing the release liner from floating. More preferably, it is 30 μm or less. In a preferred embodiment, the difference in thickness between the release liners can be 20 μm or less, and may be 15 μm or less. In addition, the lower limit of the difference in thickness between the two release liners only needs to be larger than 0, but from the viewpoint of better exhibiting the effect of different thicknesses, the difference in thickness is set to 3 μm or more. Is preferably 5 μm or more, more preferably 10 μm or more. The difference between the thicknesses of the two release liners can be suitably used in, for example, a double-sided pressure-sensitive adhesive tape in which the thickness of the base material layer is 15 μm or less (eg, 13 μm or less).

  In the above release liner, it is preferable to provide a release treatment layer on the surface of the substrate with a release treatment agent. The release treatment agent constituting the release treatment layer is not particularly limited, and for example, a silicone release treatment agent, a fluorine release treatment agent, a long-chain alkyl release treatment agent, or the like can be used. The release treatment agent can be used alone or in combination of two or more.

  As the release treatment agent, a silicone release treatment agent is suitable from the viewpoint of releasability and cost. The silicone release treatment agent can be appropriately selected from known polysiloxane release treatment agents (silicone release treatment agents) having a polysiloxane polymer as a main component. As the silicone release treatment agent, among them, an addition reaction type polysiloxane release treatment agent can be suitably used. The addition reaction type polysiloxane-based release treatment agent can be cured by addition reaction type crosslinking (curing reaction) to form a peelable film, and can exhibit useful release characteristics. Examples of such a silicone release treatment agent include a silicone release treatment agent exemplified in Japanese Patent Application Publication No. 2004-346302, Japanese Patent Application Publication No. 2004-346303, and the like.

  The addition reaction type polysiloxane release treatment agent can be appropriately selected from known addition reaction type polysiloxane release treatment agents. Examples of such a polysiloxane release treatment agent include a trade name “TPR6600” (manufactured by GE Toshiba Silicone), a trade name “KS-778” (manufactured by Shin-Etsu Chemical Co., Ltd.), and a trade name “KS-837” (Shin-Etsu). Chemical Co., Ltd.) are commercially available.

The release treatment layer can be formed by applying a release treatment agent to a predetermined surface of the release liner substrate and then performing a heating step for drying, curing reaction, or the like. In the heating step for drying, curing reaction, etc., a known or conventional heating method (for example, a method using a hot air dryer) can be used. Moreover, it is important to apply the release treatment agent in an appropriate application amount. If the coating amount of the release treatment agent is too small, the peeling force becomes large, causing a problem in practical use. On the other hand, if it is too much, the cost becomes high and it is economically disadvantageous. The appropriate coating amount (solid content) of the release treatment agent can be appropriately selected according to the type of pressure-sensitive adhesive to be used, and is, for example, 0.01 to 5 g / m ² , preferably 0.05. to 3 g / ^{m 2,} more preferably from 0.2~1g / ^{m 2.}

  The thickness of the release treatment layer is not particularly limited, and can be appropriately selected from a range of, for example, 0.03 to 10 μm (preferably 0.1 to 5 μm, more preferably 0.3 to 2 μm).

  The peeling force in the 180 ° peel test of the release liner with respect to the pressure-sensitive adhesive layer surface (adhesive surface) in the double-sided pressure-sensitive adhesive tape of the present invention is 0.01 N / 50 mm or more and less than 0.30 N / 50 mm, preferably 0.05 N / It is 50 mm or more and 0.28 N / 50 mm or less, More preferably, it is 0.07 N / 50 mm or more and 0.25 N / 50 mm or less. If the release force is 0.30 N / 50 mm or more, the structure of the light release type release liner of the present invention may not provide an effect of preventing lifting when the release liner is peeled off. When the peeling force is less than 0.01 N / 50 mm, the protective property is inferior, and the release liner may easily float. In addition, the peeling force regarding each release liner may be the same or different between each. Moreover, as long as both are less than 0.30 N / 50mm, either release liner may be relatively larger or smaller. However, it is better that the larger peel force does not exceed 200% of that of the smaller one. For example, the larger peel force is preferably 150% or less of the smaller peel force, and more preferably 125% or less.

Although not particularly limited, in the embodiment having two release liners having different thicknesses as described above, the release force (F ₁ ) [N / 50 mm] of the release liner having a relatively large thickness is It is advantageous that the peeling liner (F ₂ ) [N / 50 mm] of the release liner having a relatively small thickness is made higher. As described above, when the thickness of the release liner increases, the release liner may easily float. Therefore, by configuring so that F ₂ <F ₁ , floating can be effectively suppressed for any of the release liners having different thicknesses. For example, F ₁ / F ₂ can be configured to be greater than 1.0 and 1.5 or less, preferably 1.05 or more and 1.25 or less. Such a configuration can be preferably employed in, for example, a double-sided pressure-sensitive adhesive tape in which the difference in the thickness of the release liner is 5 μm or more and 40 μm or less (more preferably 10 μm or more and 30 μm or less).

  When the release liner has a configuration in which a release treatment layer is formed on the surface of a base material, for example, a release treatment agent is applied to at least one surface (particularly one side) of the base material. It can be produced by drying or curing according to the above to form a release treatment layer.

(Double-sided adhesive tape products)
FIG. 2 is a schematic sectional view showing an example of the double-sided pressure-sensitive adhesive tape in the present invention.
The pressure-sensitive adhesive layer surface (adhesive surface) of the double-sided pressure-sensitive adhesive tape of the present invention may be protected by a release liner until use. In addition, as shown in FIG. 1, each adhesive surface of the double-sided adhesive tape may be protected in a form wound in a roll shape by one release liner having both surfaces as release surfaces, Usually, in order to improve work operability, as shown in FIG. 2, in the double-sided pressure-sensitive adhesive tape 20 including the base material layer 21, the pressure-sensitive adhesive surfaces of both pressure-sensitive adhesive layers (22, 22 ′) are separated by two pieces. Each is protected by a liner (23, 23 '). The release liner is used as a protective material for the pressure-sensitive adhesive layer, and is peeled off when the double-sided pressure-sensitive adhesive tape is attached to an adherend.

  Further, the total thickness of the pressure-sensitive adhesive body and the release liner in the present invention is not particularly limited, and is preferably 180 μm or less. When the total thickness is too large, the rigidity of the entire double-sided pressure-sensitive adhesive tape protected by the release liner becomes high, and there is a case where floating tends to occur at the interface between the pressure-sensitive adhesive surface and the release liner. Moreover, when it lengthens, a roll diameter may become large and may be bulky. The total thickness is preferably 150 μm or less, more preferably 130 μm or less (for example, 125 μm or less, further 120 μm or less). The minimum of total thickness is not specifically limited, For example, it can be 60 micrometers or more.

  The double-sided pressure-sensitive adhesive tape may have a form in which sheet-like ones are laminated, or may have a form wound in a roll shape. In the present invention, the surface of the outer release liner is further protected by a surface protective material such as a product name “SPV-V” series manufactured by Nitto Denko Corporation until it is used. May be.

The matters disclosed by this specification include the following.
(1) A base material layer and a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer and a release liner are sequentially laminated on both surfaces of the base material layer, respectively, and the surface of the release liner in contact with the pressure-sensitive adhesive layer surface is JIS A double-sided pressure-sensitive adhesive tape which is a light peeling type surface having a peeling force measured in accordance with Z0237 of 0.01 N / 50 mm or more and less than 0.30 N / 50 mm.
(2) The double-sided tape according to claim 1, wherein the release liner has a structure in which a light release type release treatment layer is formed on the surface of a film or sheet as a substrate.
(3) In the above (1) or (2), the peeling force of the release liner from the pressure-sensitive adhesive layer surface is 0.05 N / 50 mm or more and 0.28 N / 50 mm or less. Double-sided tape as described.
(4) In the above (1) or (2), the peeling force of the release liner from the pressure-sensitive adhesive layer surface is 0.07 N / 50 mm or more and 0.25 N / 50 mm or less. Double-sided tape as described.
(5) The double-sided surface according to (1) or (2) above, wherein the adhesive layer has a 180 ° peel adhesive strength measured in accordance with JIS Z0237 of 2 to 20 N / 20 mm. tape.
(6) The holding force measured according to JIS Z0237 with respect to the adherend of the pressure-sensitive adhesive layer is 5.0 mm / hr or less, as described in (1) or (2) above Double-sided tape.
(7) The double-sided adhesive according to (1) or (2) above, wherein the total thickness of the base material layer and the adhesive layer formed on both sides of the double-sided adhesive tape is 3 to 80 μm. tape.
(8) The release force of the two release liners on both surfaces of the base material layer is the same as that of the pressure-sensitive adhesive layer surface, as described in (1) or (2) above Double-sided tape.
(9) The two release liners on both sides of the base material layer have different release forces from the surface of the pressure-sensitive adhesive layer, and the larger release force is the lower release force. The double-sided tape according to (1) or (2) above, which does not exceed 200%.
(10) The double-sided tape according to (1) or (2) above, wherein the release liner uses a polyester film or sheet as a base material.
(11) The double-sided tape according to (1) or (2), wherein the pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive.
(12) The double-sided tape according to (2), wherein the release treatment layer in the release liner is formed of a silicone release treatment agent.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In the following, “part” means “part by weight” unless otherwise specified.

(polymer)
In the following Examples and Comparative Examples, polymers synthesized as follows were used.
That is, 68 parts of toluene, 70 parts of 2-ethylhexyl acrylate, 30 parts of butyl acrylate, and 3 parts of acrylic acid were charged into a reactor equipped with a thermometer, a stirrer, a nitrogen introduction tube, and a reflux condenser. N ₂ ) substitution. Add azobisisobutyronitrile (manufactured by Shanghai Tri-She Textile Chemical Co., Ltd.) as an initiator, then raise the inner bath temperature to 62 ° C, maintain the same temperature, and continue until the reaction is almost complete Thereafter, the polymerization reaction was completed by cooling.
(Tackifying resin)
As the tackifying resin, a trade name “Pencel D125” (Arakawa Chemical Co., Ltd.), which is a polymerized rosin pentaerythritol ester, was used.
(Crosslinking agent)
As a crosslinking agent, the brand name "Coronate L" (Nippon Polyurethane Co., Ltd.) which is an isocyanate type crosslinking agent was used.

Example 1
3 parts of a crosslinking agent was added to 100 parts of the above polymer, and 30 parts of a tackifying resin was further added to prepare an adhesive solution.
A PET film (light release A # 25) having a thickness of 25 μm subjected to the light release treatment A (HY-S10 (Higashiyama Film Co., Ltd.) equivalent treatment) was prepared. The pressure-sensitive adhesive solution was applied to the release surface (one surface) of this PET film so that the thickness of the pressure-sensitive adhesive layer during drying was 4 μm and dried. Thus, the adhesive layer laminated | stacked on one surface of a base material layer was formed on the mold release surface (one surface) of the said PET film. Furthermore, one surface of a 2 μm-thick PET film serving as a base material layer was laminated on the surface of the pressure-sensitive adhesive layer.
A 38 μm-thick PET film (light release A # 38) subjected to the light release treatment A was prepared. The pressure-sensitive adhesive solution was applied to the release surface (2 surfaces) of this PET film so that the thickness of the pressure-sensitive adhesive layer at the time of drying was 4 μm and dried. Thus, the adhesive layer laminated | stacked on 2 surfaces of a base material layer was formed on the mold release surface (2 surfaces) of the said PET film. The pressure-sensitive adhesive layer on the two surfaces was bonded so as to be in contact with the surface (two surfaces) on which the pressure-sensitive adhesive layer of the PET film serving as the substrate layer was not laminated. In this way, double-sided pressure-sensitive adhesive tapes were prepared in which the pressure-sensitive adhesive layers were respectively laminated on the first and second surfaces of the base material layer, and the thickness of the tape excluding the release liner was 10 μm.

Example 2
Example 1 except that the thickness of the PET film to be the base material layer was changed to 4 μm, and the thickness of the two pressure-sensitive adhesive layers laminated on one surface and two surfaces of the base material layer was both 13 μm. In the same manner, a double-sided pressure-sensitive adhesive tape having a thickness of 30 μm excluding the release liner was produced.

Example 3
Example 1 except that the thickness of the PET film as the base material layer was changed to 12 μm, and the thickness of the two adhesive layers laminated on one and two sides of the base material layer was both 24 μm. In the same manner as above, a double-sided adhesive tape having a thickness of 60 μm excluding the release liner was produced.

Example 4
Example 1 except that the thickness of the PET film as the base material layer was changed to 23 μm, and the thickness of the two pressure-sensitive adhesive layers laminated on one side and two sides of the base material layer was both set to 14 μm. In the same manner as above, a double-sided pressure-sensitive adhesive tape having a thickness of 51 μm excluding the release liner was produced.

Example 5
Example 1 except that the thickness of the PET film to be the base material layer was changed to 18 μm, and the thickness of the two pressure-sensitive adhesive layers laminated on one surface and two surfaces of the base material layer was both 21 μm. In the same manner as above, a double-sided adhesive tape having a thickness of 60 μm excluding the release liner was produced.

Example 6
Example 1 except that the thickness of the PET film as the base material layer was changed to 12 μm, and the thickness of the two pressure-sensitive adhesive layers laminated on one surface and two surfaces of the base material layer were both 19 μm. In the same manner as above, a double-sided pressure-sensitive adhesive tape having a thickness of 50 μm excluding the release liner was produced.

Example 7
The thickness of the tape excluding the release liner was the same as in Example 6 except that the release treatment for the two surfaces was changed to light release treatment B (equivalent to HY-US20 (Higashiyama Film Co., Ltd.)). A 50 μm double-sided pressure-sensitive adhesive tape was produced. That is, in this example, instead of the PET film of light release A # 38 as a release liner for forming an adhesive layer to be laminated on the two surfaces of the base material layer, the thickness of 38 μm after the light release treatment B was processed. PET film (light release B # 38) was used.

Example 8
The thickness of the tape excluding the release liner in the same manner as in Example 6 except that the thicknesses of the base material of the release liner having one surface and the base material of the release liner having two surfaces were changed to 38 μm and 75 μm, respectively. A double-sided pressure-sensitive adhesive tape having a thickness of 50 μm was produced. That is, in this example, a PET film of light release A # 38 is used as a release liner for forming an adhesive layer to be laminated on one surface of a base material layer, and an adhesive layer to be laminated on two surfaces of the base material layer is formed. As the release liner to be used, a 75 μm thick PET film (light release A # 75) subjected to the light release treatment A was used.

Example 9
The thickness of the tape excluding the release liner was the same as in Example 3 except that the release treatment for the two surfaces was changed to light release treatment B (equivalent to HY-US20 (Higashiyama Film Co., Ltd.)). A 60 μm double-sided pressure-sensitive adhesive tape was produced. That is, in this example, a PET film of light release B # 38 was used as a release liner for forming an adhesive layer to be laminated on two surfaces of the base material layer.

Example 10
In Example 8, the mold release treatment for one surface was changed to light release treatment B (equivalent treatment to HY-US20 (Higashiyama Film Co., Ltd.)). That is, in this example, a PET film of light release B # 38 was used as a release liner for forming an adhesive layer to be laminated on one surface of the base material layer. In addition, as a release liner for forming an adhesive layer to be laminated on two surfaces of the base material layer, a 75 μm-thick PET film (light release B # 75) subjected to the light release treatment B was used. Other points were the same as in Example 8, and a double-sided pressure-sensitive adhesive tape having a thickness of 50 μm excluding the release liner was produced.

Example 11
A double-sided pressure-sensitive adhesive tape having a thickness of 60 μm, excluding the release liner, was obtained in the same manner as in Example 8 except that both the thicknesses of the two pressure-sensitive adhesive layers laminated on one side and two sides were changed to 24 μm. Produced.

Example 12
A double-sided pressure-sensitive adhesive tape having a thickness of 50 μm excluding the release liner was prepared in the same manner as in Example 6 except that the thickness of the base material of the release liner having one surface was changed to 12 μm. That is, in this example, a PET film (light release A # 12) having a thickness of 12 μm subjected to the light release treatment A is used as a release liner for forming an adhesive layer to be laminated on one surface of the base material layer. did.

Example 13
A double-sided pressure-sensitive adhesive tape having a thickness of 30 μm, excluding the release liner, was obtained in the same manner as in Example 3 except that the thicknesses of the two pressure-sensitive adhesive layers laminated on the first and second surfaces were both changed to 9 μm. Produced.

Comparative Example 1
Example except that the thickness of the base material of the release liner having two sides was changed to 75 μm, and the release treatment for the two sides was changed to heavy release treatment C (HY-S30 (Higashiyama Film Co., Ltd.) equivalent process) In the same manner as in No. 2, a double-sided pressure-sensitive adhesive tape having a thickness of 30 μm excluding the release liner was produced. That is, in this example, a 75 μm-thick PET film (heavy release C # 75) subjected to the above heavy release treatment C is used as a release liner for forming an adhesive layer to be laminated on two surfaces of the base material layer. did.

(Evaluation)
About each double-sided adhesive tape product obtained by the Example and the comparative example, it measured or evaluated by the following method about the peeling force and the peelability of a peeling liner. The results are shown in Table 1.

(Peeling force measurement method)
A tape piece having a width of 50 mm and a length of 150 mm was cut out from the double-sided adhesive tape product. The release liner on the opposite side of the release liner from which the release force was measured was peeled off, and a 25 μm thick PET film was attached to the exposed adhesive surface for backing. This was used as a measurement sample.
Using a tensile tester, a 180 ° peel test was performed in accordance with JIS Z0237, and 180 ° peel adhesive strength (N / 50 mm) from the pressure-sensitive adhesive layer surface of the release liner was measured. This was defined as “peeling force of the release liner”. The measurement was performed in an atmosphere of 23 ° C. ± 2 ° C. and 50% ± 5% RH under conditions of a peeling angle of 180 ° and a tensile speed of 300 mm / min. The number of tests (n number) was 3 times, and the average value was calculated.

(Evaluation method of peelability of release liner)
A double-sided pressure-sensitive adhesive tape having a size of 50 mm × 300 mm was prepared, and each release liner was peeled off at a speed of 0.3 m / min to 50 m / min. At that time, the presence or absence of a so-called “floating” phenomenon was confirmed. Specifically, when one release liner is peeled off, the peeling occurs reliably at the interface between the release liner on the side to be peeled off and the surface of the pressure-sensitive adhesive layer (adhesive surface). Can be easily peeled from the double-sided adhesive tape, or the other release liner (release liner on the non-peeled side) is not lifted from the adhesive surface of the double-sided adhesive tape or sheet, and the release liner on the side to be peeled off It was visually confirmed whether peeling occurred at the interface between the other release liner and the pressure-sensitive adhesive surface without peeling at the interface between the adhesive surface and the adhesive surface.
In addition, the evaluation criteria of the peelability of a release liner are as follows.
◯: When one release liner was peeled off, peeling was easy and the other release liner was not lifted.
X: The other release liner was lifted.

(result)
As shown in Table 1, any of the double-sided pressure-sensitive adhesive tape products according to Examples 1 to 13 can be peeled off without causing a so-called “floating” phenomenon even if the double-sided adhesive tape product is peeled off first from any side of the release liner. Peeling was caused at the interface between the release liner and the pressure-sensitive adhesive layer surface, and the release liner to be peeled could be easily peeled from the double-sided pressure-sensitive adhesive tape.

  On the other hand, in the double-sided pressure-sensitive adhesive tape according to Comparative Example 1, when the release liner on the side subjected to the heavy release treatment was peeled off, a so-called “floating” phenomenon occurred in the release liner on the side subjected to the light release treatment.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

Claims (12)

A double-sided pressure-sensitive adhesive tape comprising: a base material layer; a pressure-sensitive adhesive layer laminated on each side of the base material layer; and a release liner laminated on each pressure-sensitive adhesive layer,
The double-sided pressure-sensitive adhesive tape in which the peeling force between the release liner and the pressure-sensitive adhesive layer surface measured according to JIS Z0237 is 0.01 N / 50 mm or more and less than 0.30 N / 50 mm.   The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the release liner has a configuration in which a release treatment layer is formed on the surface of a film or sheet as a substrate.   The double-sided pressure-sensitive adhesive tape according to claim 1 or 2, wherein a peeling force of the release liner from the pressure-sensitive adhesive layer surface is 0.05 N / 50 mm or more and 0.28 N / 50 mm or less.   The double-sided according to any one of claims 1 to 3, wherein a peeling force of the release liner from the pressure-sensitive adhesive layer surface is 0.07 N / 50 mm or more and 0.25 N / 50 mm or less. Adhesive tape.   The double-sided according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive layer has a 180 ° peel adhesive strength measured in accordance with JIS Z0237 of 2 to 20 N / 20 mm. Adhesive tape.   The both sides according to any one of claims 1 to 5, wherein said adhesive layer has a holding power to a bakelite plate measured in accordance with JIS Z0237 of 5.0 mm / hr or less. Adhesive tape.   The total thickness of the base material layer in the double-sided pressure-sensitive adhesive tape and the pressure-sensitive adhesive layer laminated on both surfaces thereof is 3 to 80 µm, according to any one of claims 1 to 6, Double-sided adhesive tape.   The double-sided according to any one of claims 1 to 7, wherein two release liners on both sides of the base material layer have the same peeling force from the surface of the pressure-sensitive adhesive layer. Adhesive tape.   The two release liners on both sides of the base material layer have different peel forces from the surface of the pressure-sensitive adhesive layer, and a relatively large peel force is 200% of a relatively small peel force. It does not exceed, The double-sided adhesive tape as described in any one of Claim 1 to 8 characterized by the above-mentioned.   The double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 9, wherein the release liner uses a polyester film or sheet as a base material.   The double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 10, wherein the pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive.   The double-sided adhesive according to any one of claims 1 to 11, wherein the release liner has a configuration in which a release treatment layer is formed by a silicone-based release treatment agent on the surface of a film or sheet as a substrate. tape.

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